Preparation of iron (III) oxide pigment

US10479893B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Waldemar Czaplik · Burscheid, DE
• Guido Ketteler · Düsseldorf, DE
• Jurgen Kischkewitz · Ratingen, DE

Key dates

• Filing date: Sep 4, 2015
• Grant date: Nov 19, 2019
• Expiry date: May 21, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to an improved process for producing iron oxide red pigments by the Penniman process using nitrate (also referred to as nitrate process or direct red process).